I’ve just been checking out the Firefox 4 Beta. I must say I’m pretty impressed! It’s really fast and it is much lighter with the system resources. Firefox 4 Beta does a really good job rendering HTML5 stuff.
As I said, I only just now started using it so I haven’t a clue what it’s capable of so for now, will I be going back to Firefox? It’s hard to say. I only recently moved to Chrome. I will be using Chrome for the near future. I will play with F4 at least while it’s in Beta. It looks promising!